(i9) United States
(12) Patent Application Publication
CHEN et al.
(54) SIGNAL ISOLATORS USING MICRO-TRANSFORMERS
(75) Inventors: Baoxing CHEN, Westford, MA
(US); Geoffrey HAIGH, Boxford,
KENYON & KENYON LLP
1500 K STREET, NW
WASHINGTON, DC 20005-1257 (US)
A logic signal isolator comprising a transformer having a primary winding and a secondary winding; a transmitter circuit which drives said primary winding in response to a received logic signal, such that in response to a first type of edge in the logic signal, a signal of a first predetermined type is supplied to the primary winding and in response to a second type of edge in the logic signal, a signal of a second predetermined type is supplied to said primary winding, the primary winding and the transmitter being referenced to a first ground; and the secondary winding being referenced to a second ground which is galvanically isolated from the first ground and said secondary winding supplying to a receiver circuit signals received in correspondence to the signals provided to the primary winding, the receiver reconstructing the received logic signal from the received signals.